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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fe338a112e174a9a3bc2692fbac39eefa30a8131b31c08598bed420bf2148ac4' 
  AND token = '932aBYDjLn5GDBnyfomG9Zb4EqooJ6PN4/5po0XgCzM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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