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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '050bafa332b33c958207319d2fc7293d54cf71b1472fbf883dbe99ceff58e4cb' 
  AND token = 'DJnQx82PoNGRJooF7+9AUmVi5Eoxc0rU9jx7k4Eqtno=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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