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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ed5394634fae95b282a404e631f043c82ebed700ceed21164561b0f336f01677' 
  AND token = 'TJSAnx0h0BjSXdLph2AEQpu3Hpms7Zal5zDwjX7J2Bc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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