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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '137bb34f233c2342970cea60c40dcf56cbacb6106bec27f63afc62ae1f7de4ec' 
  AND token = 'nddnb9f+VogAdBEre+PkddOS+8wzYiFW3yGK1QaygzU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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