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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8e3636b4baeaae0e3d63a9da22fe5f9340ae65e3d2d4838ea0e80eaad810cad1' 
  AND token = 'u9FL6xXzcW3fkKKAV01MnzsHs1N9PhjQOh1tcEllw80=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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