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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd362e1cd48bdf55e3f8f5a70f30db6e10099f5876541fdfe11f902a3ee61c708' 
  AND token = '+HxBFITmo4ugpY7gSrfYlgo8gicpGZaWh0H4GIyNH2s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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