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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c4e9743b61cb97c6d2f43953cb1a56be85a9a8d87d4553cd3298aa4eb5557e14' 
  AND token = 'yAaU0H6rC2XGcUiK8WJDXKH99cEnxREhBFeaSNVcxng=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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