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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6919d8d6047724c5b990601ebd640d97f0cac84b543875988b379bdc074fa9d6' 
  AND token = 'aHYyL5OLCfOe/zQkYImaUESg9KeEpGNcMa8oU/VCGmM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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