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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fc1ba48503b2099cc43fad95d1d3c952adbb4ef9bb918314405171e7c55eae57' 
  AND token = 'ilExeO2IqEdqXM7tLlMsD4lyk1hJSb8ytquiyBTCqTw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00141

JSON explain

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