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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f316cbae76bd87b3b99cb305def560d8d2726b79ade13e5f5cdd55b1df4ace14' 
  AND token = 'WAm4zNtd37QuW/w7Kb+Oc1wVF+V3psULbVryp5m5OA8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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