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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c4d318e86b890722d9a7844ee2b0efc95aa47e0ad9746e40fea67ba7745047ab' 
  AND token = 'HLpKcgw4Bu89aHv0T/dfRmcPR2nitYc34lxfPA5z/Vo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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