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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ddce46ac3b2d7d281f8e6d1b3e7a98451d4e2958cb9da807c956cc56f83fa2d6' 
  AND token = '9Ltzcjzno/ArGfTBlhP5w/o++MsdPCfWOm+Hh658TQM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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