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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '41f6b46ac62d9caca0a8fc2cb88eaf3d56d5fdbc26e6dda91025c8f7b631d9d5' 
  AND token = 'jd81Q3NwbFUQfspNk6xi/U97/AqTa6GLHwoalvyZOEQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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