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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aaedd9fad2e129cd63b2d555911faf9d2769d0bb272b6c1c6994ada95bb8a8cb' 
  AND token = 'UJ+4tBAHcapw9k2c4QkdEtD+zjSXCMB8YgxSDyEXeUE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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