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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9c72d9975a68de145f8149eaec412372ff6619a179e254bc8b86037bb5a1963c' 
  AND token = 'H6Mpg7YJSqnBKsG6H1LU6T5JdqU2VwTrXA9wykA0oLA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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