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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c613f7ca0a3942d5cb61461d13391f660024166842f89068b46b9485990e30db' 
  AND token = 'vZuA/ZhyFt1L5pKxQaen3xGhi3YB0oY8Yk9yJ1iZX+4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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