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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '60cc04472595ceacd7f76d2610a4d5e6ce76c65994991fcdff75b0d2020873e4' 
  AND token = '3HdBeYrvPUh0eJUu8nsedOmJS7fF5pxJ6UFJ+JMnjLE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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