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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4e3037c36d5fb08ad553f5647192183601e88f7be7bacf74db2b3eac9edc90f1' 
  AND token = 'cJXPAjhGwsyfOnjVP8ZCRItsmN2PvpvyzeMisDA2OlE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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