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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '88efd43cd1e3a340f07a0e3ee2f51c30c8d022a87448046d0b5644124b121c42' 
  AND token = 'AjNynk9F4R0cPl5TqCpmZPCReOeV3m9KufFD/oPeEyw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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