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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '656eb98cfafdff8a3291adff3a201c0fe56ae48ba1aa9cc74de94c7987332912' 
  AND token = 'rHTtMMx5QDp8QcX1cmAKKS9oIh+lBbHnnL1OqEsut8U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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