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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3b31a4b8f221e95ba434b5a9c9bca21fcb2bb1717c114efc5f2f86d3f64f8879' 
  AND token = 'qxCufru3w4zK5rG0HeokI7ecHTifX9gs5jM5A9k3+Jw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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