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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f7dc314967bf8b453cbb4d8aaf87fcac61ac3a797c82ff6a3155885b8767f870' 
  AND token = '8QWW7SzG0lPW4tNySKdFBen1lx7nW89tXZeErZlFymg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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