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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f2dff853b9fb4753cdb38a1a92aca3d4ad95d99de5996ca6d633d5a1bf23b403' 
  AND token = '6gzeJVoKO1/ukqC7Ieso4ynF6Hg6dn36sNvuyoQvAcU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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