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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eb40eeb1b61132f0cbcc91a250291e9b3b1f87776cec5366f6c88a617c92458b' 
  AND token = 'bEvVGSV/AQVGKUZ2l59QcEfo1H0bouoU4/onjQAS16Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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