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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '26dee4d22ead2e3f13aeba954ec5372197e539d2c399948d565d5d7ea7b7a902' 
  AND token = 'MhXD2+GE7wsiaJ9CcUe9uXfgTvHjY25NHOLGyHPFUhw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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