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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bdbd179165fe3332e142f54efe42bdac71998d91d27b24e9d921d8ab2befe49c' 
  AND token = 'wAvidEScR2Sx1wFBI6f5Bk/JtUM34Qx2hOLRcapGYPg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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