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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'be4c5b1bbc1910648220e26f112457f33281a3d48dbb517e454117cfdb4a343f' 
  AND token = 'KEGHatt1zgOgWyyFLzDiXoinggkty8eM9uzy90BWYT4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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