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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '91652efae71922af6dac4d9b24b0f4ad17c0a0345aa75dcf4fe582fe96aaa89c' 
  AND token = 'cFYUi5AN+HYpg2s18HoGygLKGxpcpylqHCv5+4T1alM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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