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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '063e14cf2dfdbcb63f490830b75b8be7cc18b72741b794419f1c0e0487841efc' 
  AND token = 'XJSIGHuoT2TThltSeKKkRPFpeb7wJ4Bpk6teTcZa8cg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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