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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2ef347bd67fe0a3853047bc0d64c6e7ed4d3099941461f2812e1c8df69eac5d4' 
  AND token = 'wNbKHZmlb2DAD9Fh3kAvQSHRFJiNUSqiyffEm6Au/WA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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