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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c09c1c0fea3f83aea2f534a37c9dd5c16b7eb4b2eb075da2bd4c534d388fe940' 
  AND token = 'f8REdtF6nCPxfIlb3EEFU8KcjpHx5j3lLCBFQiFyCts=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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