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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '90851615a0d9c9eca4533e6009b9147e3876b5ea33b4155681ab6d693013b67a' 
  AND token = 'wxNze7u9TBHddX4ezoX4QQIPzHFDNn61QiDZQjyDv4Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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