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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ca5651a1d818e176360af31ab425d2c057848077c6c89d955e64940c26b69fc9' 
  AND token = 'bfRqXgUvOFAoLl4o9rXDTo2Rc1w2BpdpyA3UhEjmGRM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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