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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '104f5b00ae28fdf8861ae6e4d47434a87945213c04939aefd54b822b08dd6d6d' 
  AND token = '1X0PAVGtUZqkbOuOzp1zlAwT2gDFw2U8znAhTYPnTQs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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