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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0414b69073ef155401d4efdeaba1d4e629a4385e725da2dfefec95f0036682d3' 
  AND token = 'gvIxItYtEY6ciIVakGlcZqfHRzVVEy5Nvaf/v5LWgGk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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