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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6e28b64256a3de63eaa46fe34393ccc58f1556cbb9ad21f2117d579d95fa324f' 
  AND token = 'u02QvfKEg8TIJlp9OK0vPd0H14lxzPcspG0NNbeNrSU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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