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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '00f82f39e2c76c8f1a516093d0f54a25df923f379b5a882caa3d148d9fb75ea5' 
  AND token = 'w4eNDgBtODVd4ememfTf4V0qsSmSoUy6cBPsjqpqtl4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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