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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '23afe015bdf48509d54c4955dfaa25df092910a607097fd1925a41ac60cc67bf' 
  AND token = 'KEL/qhVaSDJgEgxUe1pY4qg8Z7/dAIubPByW5mNl0vY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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