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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '39084a94ba656312871951f7281f3c71f48c6673ae94429d1a9a8c4406d92a6b' 
  AND token = '/1HbAqVWRIHAQgtpkiA4CHIvB6hIsrmh908o+3gyReM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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