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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c03914eee6f32dfa820de5f5780bb50e9e90da3b21c18d5b59bbab7d6cc3135e' 
  AND token = 'qcES86TFbxu75I/ZZeAu71xwdYhiQaL+XycMVP+ikF0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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