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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5cd9f1e2525fd6e7e2cf57005cb8cdeea8e87077e60da9eadf83c403b1e97a3e' 
  AND token = 'hHqxCDYsZVeOBTdS0oH0XyJqkT7ts9az33y6j3tHYqM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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