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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fc6909341bd0ac59751c84a2aef71ce57ac7f0c840d651317235802abec5f209' 
  AND token = 'CR42yDKRFPCxRZiefXn8UGYfpQPFYJ3/+LeuQ47AiJE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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