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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '526bc44755c7ce59c4b261e94c32e1ad7cdbcbd54171fd955bc7532d6cba2a29' 
  AND token = 'tyRIXfoMGJi7sGF1W1bT1ivo3sviOpkgSL5qZlRi+20=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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