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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f2f99dc1ccd82ec2d3a8144c47ad92901142503965d2ff1287a9574ce8a88ec2' 
  AND token = 'LPXRooqpVi1EN/Wufps5Jc0RZEbA1bhd2UmPxknpLgc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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