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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9830f9aab40b4e6079c415ee2d7a80828da611c48e0869248dc2af2bdceb4e67' 
  AND token = 'Zmdcp+yvYIhoDU5S/n47rheh3qds+D9bskwfSVkeD50=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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