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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '44fe62098d09d96fecab9c4e33509550c5c0b05b15278080fece1a026c3882c7' 
  AND token = 'unP2puT3H0hKHQknKHhtEGtLE1H80Gjsjb6tTx3hu4s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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