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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7b4bfab48b32b5e7af571a95ad2ed681b2fffe9193dfef0a963a605796e86117' 
  AND token = '9j/AzGjExCYeYSxsVVwx0Dzhfvyy3WuEM2EBQakTnSs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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