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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2cb0e2f3c4860213bfee21e1552152f80e37762537cd78ab0ca673dfec0ed3a5' 
  AND token = 'SqwQv5aeMXF/DvqnogHjAPDJ7Y81ccR0IvYwon05vkA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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