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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f9303fe815a02587ffb06088a48ab52a6841293004185167fc5b739b1eb3f772' 
  AND token = 'thWeumq0mqwQ9Hh69EIqfwRUNz9V6qRc5jlhJ41KLp4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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