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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '804462d29d2a85dc1e4113cb2820a0512f5fe7776792167a64f69e4c0c497083' 
  AND token = 'jZsMsNexcXAzttH57Xll1Rofog7zqt372KIO820jgnk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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