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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4250d347a11ee02c1ffc39a9ba766ab045db1bdc28b1293473be69e1496c7e47' 
  AND token = 'xP2IInbzfltzBKPQMThC00ZpgX6u4M7sQQjGXxT+Px8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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