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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '660382e96ed4ec92f0bc19523f0bda9ee69c9ac5890e8e6016a6badc546951bb' 
  AND token = 'OK2IkrOUu+unob299SQwLEslyZHgDU67sO8hRiHQ6hA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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