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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e426467e0393eac38e570f59c48723f8191dc09cb3b9aba3ad79ecff9c8d5c63' 
  AND token = 'wt6ma0yRuUppDTX3O7AukyiUWgY39KdGpVxfwDqHqfY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00056

JSON explain

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