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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '36bc1219291d924e9bac86c622eb5557540f80acee02749d366686aaaa1e0fba' 
  AND token = '0r9iCYtvGQf2OqUqmb6qMLGh6Bg7kIF1V2VUBkYNi+Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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