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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd63e1e33158984aea97b442c954dfc9ed19f1348397c570f2ffd4eb504717e98' 
  AND token = 'L0kUJs2hptBAHOpsC4+n2BZ1QgieFOR2Q/c+LjsQivQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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