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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '839b9d267cb0d22ed1acf81cad7eac6a13f9e22307a31fcde1e24594c4c7c926' 
  AND token = 'BLz/70dIhYEv7XG39Ysa74ZdXdMmojAsfS+2Oi13o64=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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