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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '980db863b44d755d5c5ffa48166aee29c067310d4912622db9cc00d175914172' 
  AND token = 'kXvEUkuNocjzncpPDNyaIgm8DKdMdh1DWEIXysW6Gjs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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