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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '816cb92ec1165144cfd721c859fcbeadb8d5da7c797fc5fa0e65a76b037dce1c' 
  AND token = 'LI9oZbu7qIve6ZqthGmnaAODPQr2G0qiC38hL5l7Aug=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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