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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fe9ea4e0e79354364ae066c5c4050dc8a819b74d2e0059787f2a076069a55c6d' 
  AND token = 'EhXKbBUNWaKwuiuCx7N2r/oPEx9fJnt5jwZcSlQMALk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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