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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '05d39320ea15be3f498cc1f77f2179f23d3f9fbd18c3ab47823f769da1cfd5e8' 
  AND token = '6zMXaZxz4KrfJCZid12LuSW85zniGL+QyTBLgQNfPUE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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