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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3a1d62f055dc4e8e6768a8e54613a4397ef46dd64f6051c650e40481f3d387f1' 
  AND token = 'rKjoVwaCi5jEtVkWapCVNnx9UoYMT69WaMvOWM3z1XA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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