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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '839b0c072821d25d0c27f75353b97c1cb768d3b4b0bf07a3d25ee690ada62ba0' 
  AND token = 'eslIHeLoujS2Kg/g7pDE+8Bf+Hu15UQkpuTVxkskG7k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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