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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '711857032eb3e7e074735178577b2810c5dcf8efec71899ed1f72f6257945fbc' 
  AND token = 'lRECnBOxwsUlKB6iFRJIANrvAdMeYz7twiV4xXH9kCQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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