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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dfceb8bc17ac1c73f7b9cafd7055ceba3ca43484172f54e4a769bd1ced1759bf' 
  AND token = 'j2SjzkND8BOzHbjSa8P9YVMuMWU6rlGRyiQZoGE9xCY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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