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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '14bae29fe64eb673065597639630569f018b5572c5e74323d4b77c8937c796fb' 
  AND token = '4Zv5N6F1gUnzPiyzqnxYF9VUJIdeb1Uzey/0IwELGwE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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