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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '927087aa72b48a5c8d16da421770af900e1f5dab0c2b1e42fe32790490da02f3' 
  AND token = 'AxR5D/fg6emlyimVyhBcTFGeJ8uFhrEwGgFljOmWAfE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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