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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '176eb025c04ac25b40bf75a857df01f85902d1714d226ed6eaf45c86710a076f' 
  AND token = 'TQat2YZmV8HJm7NSYuFNNRFc/AyzXTJXdnMawGUXT4w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00071

JSON explain

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