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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0ddd31e395137c1e4c501f66fe5c70926b4bc9891cf4746962adf89c35a9dbaa' 
  AND token = 'Mdb6GOTnNPAQSkqIUdEBKlJql8U7SCO063MGDIUbN/U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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