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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f69b9cbbb21450ff672a5754b35db2e3c10a78aab41b4bdc99e66690ec9ed18d' 
  AND token = 'VxvDNWUpCMdGSOldNXr/e/WI3t771N4f37eJKk5VQVI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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