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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bd41b3707c5fcf57afececf50eca6fd547d156f36708e08f4d0b2e49dba4a54e' 
  AND token = '+8WlHpOB/rLN5bMjUDGYQ6Zu4hdPY7akF3jsOkSVr04=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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