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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3ed3122b5a3c85c0ac4c6a428a104e26df3683ce769a34a1ab7c396292b0ed3f' 
  AND token = 'jQAtpc99ugCyIDyXr/9kYvGPGOSh14wXqKU1sHPE8AE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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