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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7fcf016817fae7e95c679c1e74a6c01901feedc2a4536cb4257d736feca6bc84' 
  AND token = 'ddXCggfuLgmFL+aYBS35D021Dic8WiGs0vt5ihex5pI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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