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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '959652a120fef7b35971f7c5dc9ebed5c62ac7be83fac28ef7a77a0795977a91' 
  AND token = '3KfgUuN2ZhRo6J8xyoFQV3bJSxnQhzzK1C9Q+Bpe9eo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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