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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '99d009d98dc91cbee80d442f1bd9cdbceed66d2cb78ae6d3a7898918bba5a933' 
  AND token = '5SHo+dun+yja4Kd3Z7FMFYZyBz3wIiJL0pzy3LaSeIs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}