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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'de2fb11e087c9761f5e8f543114838e73bc2f6340759ad7ff5d52dc4beb3f8f6' 
  AND token = 'y1eRhR8t+Xxuh4sHH0ThVPJw4GadCwJ8Rv19ctF4H8Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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