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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7c3bf833881c5749b079c0acd773ef41657f169b0bb095beb8375365d3f75838' 
  AND token = '9KJNe67LYCDUj0cVHZyQs8es3Nv7thHtMvki1cjZUmE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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